What are the potential results of flame impingement on boiler tubes?

Flame impingement on boiler tubes occurs when the flame contact directly strikes the surfaces of the tubes rather than maintaining a uniform distance. This phenomenon can lead to several detrimental effects, primarily due to the intense localized heating and thermal stress caused by the direct contact of the flame.

When flame impinges on the tubes, it can create hot spots that result in uneven heating. This localized overheating can lead to the formation of molten deposits, known as slag, which can accumulate on the tubes and insulate the surface. Over time, the buildup of slag can further contribute to accelerated heat transfer surface degradation and corrosion, which compromises the integrity of the boiler tubes. Such corrosion can manifest as pitting or general thinning, significantly reducing the lifespan of the boiler.

This combination of slagging and corrosion not only decreases overall efficiency but also increases maintenance needs and operational costs. It emphasizes the importance of proper burner alignment and flame management to maintain uniform heat distribution across the boiler components and ultimately ensure safe and efficient boiler operation.